Silicone key product features and applications
Silicone rubber is a polymer molecule by Si-O (Si - O) is bonded to a chain structure, consisting essentially of high molar mass linear polysiloxane. Since the Si-O-Si bond is a bond type which constitutes the basic, primary connection methyl silicon atom, a very small amount introduced into the side chain of unsaturated groups, a small intermolecular force, a spiral molecular structure, methyl outwardly arrangement and can rotate freely, so that the silicone rubber than other ordinary rubber having better heat resistance, electrical insulation, chemical stability and so on. A typical silicone rubber formaldehyde i.e. polydimethyl siloxane, having a spiral molecular structure, a smaller force between its molecule, which has a good resilience, while pointing to the spiral outer oxymethylene group free to rotate, thus making the silicone rubber with unique surface properties, such as hydrophobic surfaces and anti-blocking properties. The following table lists the main characteristics of silicone products and applications.
Heat resistance: silicone rubber has a much better than ordinary heat resistance, can almost always use no performance change at 150 degrees; can be used continuously for 10,000 hours at 200 degrees; can also be used at 350 degrees period of time. Widely used in situations requiring heat: heat thermos ring cooker ring handle.
Cold: ordinary rubber late -20 degrees to -30 degrees, i.e., the silicone rubber is from -60 degrees to -70 degrees, still has good elasticity, the silicone rubber may also be subjected to some special formulation extremely low temperatures. Low temperature seals.
Weather resistance: ordinary rubber rapid degradation in the corona discharge ozone action, while silicone rubber is not subject to the effects of ozone. And a long time in the UV and other weather conditions, its physical properties are only minor changes. Sealing materials for outdoor use.
Conductivity: When adding conductive filler (e.g. carbon black), a conductive silicone rubber will have a keypad contact points.
Thermal conductivity: When adding some heat conductive filler, it has a thermal conductivity of silicone rubber heat sink thermal gasket copiers, fax thermal roll.
Electrical properties: silicone rubber having a high resistivity and within a wide temperature and frequency range whose resistance remains stable. Meanwhile silicone rubber for high-voltage corona discharge and arc discharge has good resistance. High Voltage Insulator TV high hat other electrical parts.
Radiation resistance: resistance to radiation phenyl containing silicone rubber insulated cables greatly improve the electrical connectors and other nuclear power plants.
Permeability: silicone rubber films than ordinary rubber and plastic waxing film having better permeability. Further characterized in that different gas permeability has a strong selectivity. Membrane gas exchange medical supplies artificial organs.
Flammability: silicone rubber itself is combustible, but when you add a small amount of anti-burning agent, it will have a flame retardant and self-extinguishing; and because organic halide-free silicone rubber, which does not emit smoke or toxic gases when burned. Various fire strict occasions.
Silicone Uses: Can be used in high-voltage molded edge promoter and other electronic components; for the production of television sets, computers, copiers, etc., also used as a demand for weather resistance and durability of molded gaskets, packaging materials electronic components, automotive electrical parts maintenance materials. Can be used for housing construction and repair, joint sealing and caulking reservoir highway, bridge seal. In addition, there are special-purpose silicone rubber, such as a conductive silicone rubber, medical silicone rubber, foamed silicone rubber, silicone rubber molding, the heat-shrinkable silicone rubber.
Two-component RTV silicone rubber (referred to RTV-2) there is no one-component RTV silicone rubber (referred to as RTV-1) easy to use, but the ratio of wealth to the change of its components, you can get a variety of curing a variety of specifications features products, and also the depth of cure, so it is material widely used in electronic appliances, automobiles, machinery, construction, textile, chemical industry, printing and other industries for insulation, packaging, caulking, sealing, moisture-proof and shock resistant. In addition, due to the RTV-2 has excellent release properties, so as soft mold material is used extensively for artifacts, crafts, toys, electronics, machinery parts and other replication and manufacturing.
Silicone Rubber Earplugs: Wear comfortable, well noise barrier to protect the eardrum.
Silicone rubber suction fetal head: simple operation, safe, can produce changes according to the fetal head size, attracting fetal scalp will not be pumped to prevent scalp hematoma and brain damage and other ills, can greatly reduce the time pregnant women giving birth pain.
Silicone rubber artificial blood vessels: a remarkable physiological function, can be done with the human body, "intimacy", the human body does not reject it, after a certain period of time will completely meet with human tissue, extremely good stability.
Silicone rubber sheet tympanic membrane repair: its slice thin and soft, smooth finish and good toughness. Is an ideal material for repair of the eardrum, and easy to operate, the effect is quite good.
Addition silicone rubber artificial trachea, artificial lungs, artificial bone, duodenum silicone rubber tube, are very good efficacy. With the improvement and development of modern science and technology, silicon rubber use in medicine will have a more promising future.